EMPLOYEE WAS CHECKING FOR OVERSIZE GETTING IN STONE PILE, AS HE WAS STANDING AT THE NW CORNER OF THE DECK SCREEN A LARGE ROCK FELL FROM THE TOP DECK OF THE SCREEN ND HIT HIM IN THE HEAD. HE DID HAVE A HARD HAT ON BUT THE ACCIDENT BROKETHE SKIN ON HIS FOREHEAD. WHEN THE ROCK SMASHED THE HARD HAT ON HIS HEAD HIS NECK ALSO BECAME STIFF.